.177 Trajectory…
Okay so this just maybe Chairgun not handling the situation thing. But I always hear people talking about the flat trajectory of the .177 caliber pellets. But with everything being equal the trajectory is the same as .22. According to chairgun. What am I missing?
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Yes speed is a issue, to keep the speed at 100 meters more then 1 mach you need a lot of power, maybe with Helium 😈 so you need at VO at 1800 ft/sec. 🙄 when you shoot with crosman heavy’s to stay over the 1100 ft/sec at 100 meters, Better to shoot it subsonic and have fun.
Okay fooks they are AIRGUNS, so you can better take a .17 HMR
The faster the pellet goes, the peak of instability @ she speed of sound…. Snap! It was approaching that point with increasing turbulence; Thus needing a heavier grain to hold a straight line. blaaa bllaaa just a part of thought
Hi,
thank you for the info, but I’m looking for good grouping at 100 meters, will give it a try with a heavy frame ( one big brass bushing for the barrel) and some nice JSB heavy’s 10,33 grains.
but first tune my .22 and, after that the .25 😉
A lot of work to do.
Great work on this subject ,i like it very much
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TaylorMade Burner 2.0
TaylorMade Burner 2.0
golf technique
golf technique
I’ve mentioned this pellet before… but for 177 hard hitting power try this 15.8gn pellet that groups 1″ at 33 yards out of my humble Talon SS 12″. I get 22-23ft/lbs when a Kodiak gets just 18ft/lbs… http://www.pyramydair.com/s/p/Predator_Big_Boy_Senior_177_cal_15_8_Grains_Domed_150ct/804
you can use 21 grains piledrivers in your .177 barrel.
don’t know if they fly good but they have a very good bc.
when you have a power of 30 ft/lbs they fly flat 😈
Nobody but me would want to tune a Condor .22 down for a stealthy 12″ x .177 caliber. So everyone else is missing something. You won’t know til you try it.
But, for .177 Trajectory I discovered something interesting. I don’ t remember why I settled on Zero of the 26 yards that I have but the other day I decided to check the FPS at higher PSI. I had been shooting from about 760 PSI at 685 FPS and stepping up:
PSI….FPS….NOTES (10 shot groups)
760….685….ONLY PING 1″ group
790….700….ONLY PING 1 1/4″ group
935….750….ONLY PING 1 1/4″ group
1110…800…ONLY PING 1″+ group
1200…830…ONLY PING 1″+ group
1300…835…NOISY 3/4″ group
1500…875…NOISY W/POI 3 MIL DOT HIGHER 1/2″ group
Not good shooting but the best I could do in gusty winds.
What was really interesting to me was the 3 Mil Dot higher POI at 1500 PSI over the 1300 PSI with only an increase of 40 FPS.
Just how I like my women! lmao NO SKIRT
How bad does it mess them up?
Accuracy only? tumbling?
Plenty of others will chime in I am sure because many have said pellets get a little crazy when breaking the sound barrier. I would be interested in your results. I want my air gun quiet but would be interested in real life results. I put a predator pellet in after tuning for Ejuns (really heavy pellet forget what grain) and the crack made me run and hide inside the house! lol
The pellet only stays SS for a few yards past the muzzle. Its the trans-sonic stage that causes the inaccuracy. Skirted pellets nah like that stage! Though I would love to see some Surefire slugs at SS to see if they faired better, what with no skirt an’ all…..
Nevermind… check this thread out… http://www.gatewaytoairguns.org/GTA/index.php?topic=2072.0
So for my powder burners it makes sense to re-zero after a significant change in temperature or altitude.
I am 980ft above sea level. What does altitude do to PCP or is it any projectile?
I have never tried accuracy above the sound barrier myself.
Plenty of others will chime in I am sure because many have said pellets get a little crazy when breaking the sound barrier. I would be interested in your results. I want my air gun quiet but would be interested in real life results. I put a predator pellet in after tuning for Ejuns (really heavy pellet forget what grain) and the crack made me run and hide inside the house! lol
I had 18.1 JSBs running at 1130 at the range on Sunday. It was fun watching the pistol shooters look over at the sound barrier “crack” from my humble pellet gun.
I was running a 24″ Condor .22 with stock everything. I didn’t have a scope, so I couldn’t do accuracy testing. I will definitely dial down the power to 950-1050fps when I get serious.
most springers in .177 only get a MAX of 1000 fps usually, though it settles around 950 in my experience. A .22 condor easily hits over 1000 fps with jsb 18.1 gr. that gives you both the trajectory and raw power you’re looking for. In general go with the PCP every time. they usually have better velocities and accuracy
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A 17HMR will hold sub 1″ at 100 yards all day long with 50yards @ +0.25″ and 100yards @ 0.00″. And there’s something reassuring about the target impact before the muzzle blast has finished sounding off. Mach 2.3 baby – yeah!